This Harmony XB4 Integral LED comes with a 48V AC/DC BA9s base. It is compatible with Harmony XB4 and XB5 and contains 10 pieces. It is easily installed in standard 22mm diameter control and signaling devices and is sold in a pack of 10. The simple modular design makes it easy for non-professionals to maintain, modify and adapt machines after installation. It is designed to fit into standard 22mm control and signaling devices, ensuring compatibility when installing in existing machines. It has high brightness for easy identification of function and operating mode.